Affiliation: NoneWhen she emerged, Cassandra located a secret "wild" Master Mold in the South American jungles that was able to adapt existing technology into a wide variety of lethal Sentinel forms. She convinced a cousin of Bolivar Trask to accompany her to the Master Mold, where his voice activated the control protocols. After killing Trask by merging herself into his body, she dispatched giant Sentinels to Genosha, resulting in the genocidal massacre of over sixteen million mutants, including Magneto. Her "Wild Sentinels" also attacked the X-Wing, downing it with Cyclops, Wolverine and their passenger Ugly John aboard. The X-Men subdued Nova, but lost Ugly John. Wolverine severed Cassandra's vocal cords and she was brought to the Institute, where she began to exert telekinetic and telepathic control over the X-Men, making her way to Cerebra by phasing in an effort to destroy all mutants. Then Emma snapped her neck, stunning Cassandra, who was finally put down by six gunshots from Charles.
What no one realized at the time was that just before the shots, Cassandra switched her mind into Charles's body and vice versa. Using Charles's form, Cassandra "outed" him and the X-Men to the world, then left Earth with Lilandra for a "vacation." While in the Shi'ar Empire, Cassandra used her powers to take control of the Imperial Fleet and began to destroy the Empire. Lilandra made for Earth, but Cassandra destroyed the ship, and upon arrival back at the Institute took down the Superguardians as well. By this point, Cassandra (in Charles's body) had constructed a psychic monster around herself, seemingly made up of the flailing body parts of all the people she had absorbed or controlled.
After beating off all comers, Cassandra again came to Cerebra. She tried to use Cerebra to access the minds of all Earth's mutants, but Charles's mind was waiting for her (put there by Jean) and he forced her out of his body. Formless and with no life support, Cassandra flailed about until Emma came in with Cassandra's body, which the entity entered, only to be trapped inside, as her real body was dead, and this body was the Imperial Superguardian shapeshifter Stuff.
Nova was then trapped inside Stuff. Her mind was supposedly blanked and was being re-educated by mental simulcra of Professor X and Phoenix. It appears that she was allowed to take the form of the "super-strong" girl Ernst while she underwent her re-training, which may explain why Ernst always carried along the disembodied brain of Martha Johanssen (No-Girl) - Martha was probably performing the telepathic re-education on an ongoing basis. However, it should be noted that Cyclops and Beast did not know about this transformation, and it is uncertain whether Xavier himself did. Furthermore, Ernst seems not to have returned to the school after its reconstruction, leading to the question of her and Martha's whereabouts...
Recently, Cassandra appeared in the Mansion, working with Emma and Shaw's new Hellfire Club to de-stabilize Cyclops's team. Cassandra used her powers to make Beast devolve and returned Logan to his childhood mentality. Eventually, "Perfection," who appeared to be Emma Frost in White Queen garb, made Shadowcat believe her child was trapped in a containment unit in the sub-basement of the mansion. Kitty removed the occupant, which was the alien Stuff, freeing Cassandra's mind again. Cyclops deduced that Cassandra had stored a small portion of herself inside Emma, whose survivor's guilt made her vulnerable, and the Hellfire Club were just projections. He managed to convice Emma to prevent Cassandra from re-emerging, but it's unclear whether Cassandra escaped into someone else.
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